A survey of intelligent environment control technology in greenhouse

Intelligent greenhouse, as a sample of agricultural modernization, aims to optimize the economic profits. The prevalent strategies about greenhouse control are based on model control and /or knowledge control. Its control technology falls into the following three levels: the optimization of control system only from the angle of plant growth or energy conservation, that from the angle of combining plant growth, production and energy conservation and that taking all factors concerning planting management into consideration: whole process of plant growth, market, cost change and energy conservation. The current more advanced greenhouse control technology in China still remains at the first level. Its trend is to strengthen the integration of both theories with practice alld introduce intelligent control method and knowledge engineering and finally realize the man_machine intelligent conrtol.